package onlinediary.interceptor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Slf4j
public class LoginInterceptor implements HandlerInterceptor {

    /**
     * 在目标控制器方法之前执行
     * 验证是否登录
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        log.info("拦截的请求路径是：" + requestURI);

        HttpSession session = request.getSession();
        Object user = session.getAttribute("loginUser");
        if (user != null) {
            return true;
        }
        //未登录，拦截,转发到登录页面
        request.setAttribute("msg", "未登录，请先登录！");
        request.getRequestDispatcher("/login.html").forward(request,response);
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
